SYNOPSIS. 251 



Genus— DYSIDEA (Duseideia.) 



Character. Spongia multiformis sessilis crasse cellulosa 

 mucagine sabulo arenata scatcns, siccata friabilis, fibris im- 

 perfectis seposita : spiculis sparsis paucis fornici et magnitu- 

 dine incertis. 



1. D. FRAGiLis, informis sessilis crassa arena asperata, sic- 

 cata friabilis, spiculis paucis nee certae figuroe. 



2. D ? PAPILLOSA, arenacea lutosa crustacea mamillis cy- 

 liudraceis perforatis, apicibus rotundis et ocellatis, ornata. Coch- 

 leas incrustans. 



Genus— HALISARCA. 

 Character. Spongia gelatinosa diffuse repens cute tenui 

 et Isevi vestita spiculis ct cellulis fibratis carens. — Genus lit- 

 torosum, rupes et fucorum radices oruans. 



1. H. DuJARDiNii. Generis unica species. 



Genus— GRANTIA. 



Character. Spongise plerumque albicantes minutissime 

 porosffi ncc vi rcsilicndi prccditoe, c spiculis calcarcis multi- 

 formibus in mcmbrana gelatinosa contcxtcc ; osculis rotun- 

 dis planis. — Parvum sod nitiduni genus fucos confervas- 

 fj[uc littorales amans, ncc rupcs effugiens. 



* Cavcc. 



1. Gr. compress a, simplex compressa foliacea subtilissinie 

 porosa laevis ; osculis paucis vel in ajjice vel in margine perfo- 

 ratis ; spiculis clavatis et triradiatis. 



2. Gu. LACuxosA, simplex flabellatiui complanata brevi pc- 



